SB8200 and TP-Link 5400 speedtest woes

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nyichiban

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Feb 21, 2008
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So I recently got a SB8200 because of the PUMA 6 chip issues but seems to have more issues with the sb8200 than the 6190 it replaced. Here are the specs:

Modem: SB 8200
Router: TP-Link Archer C5400
Computer Ethernet: Intel 219, 211 and Aquantia 10gbs
ISP: Spectrum (formerly Timewarner)

Problem I'm having is that when the router test for speeds I get 400+. When I test for speeds from the computer no matter which ethernet I use I get 220-240. Previously with the 6190 I didn't have this issue and it was sitting at 350 from either connection. Also while playing games online the ping would jump at times up to almost 300ms sporatically where it never happened like that before. Simple solution is to go back to the 6190 I know but wanted to see if there was something else that could be the issue. The only positive I see is that the ping for my games have dropped from 44 to 38ms when gaming.
 
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That is because when you even use the simplest QoS functions it disables the NAT acceleration. That means all traffic is now being processed by the cpu rather than using the hardware accelerator chip.

Try to factory reset the router and then only configure the lan ip's and the wireless settings. The router is pretty much only doing the NAT function at this time and that is running via the hardware accelerator so it should be able to run 350m.

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bill001g

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I would bypass the router, mostly because there is not much else to try. The computer should not be affected by the modem but as the issue with the puma chipset points out manufactures are doing things they really should not be.

The issue with the puma chipset is not that bad anymore. They have a patch out that most ISP have pushed to the affected modems. The one for the 6190 I think ends in 93v. The testing tools still flag problems but real world issue are much less, seems you can come up with traffic that will still cause a issue but it is not something that you see.

If you swap the modem and the problem goes away it pretty much points to the new modem as the issue. Still the modem should not know if the traffic is coming from the router cpu or your pc cpu. Both come from exactly the same port with exactly the same IP addresses and even mac addresses.
 
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nyichiban

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Feb 21, 2008
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So I swapped it back to the 6190 and did a speed test. The speeds are slower by about 100mbs, getting 340 from the router instead of 440 with the 8200. Ping is back up to 44 instead of 38 for gaming. I guess I lose some speeds on speedtest but not much change from before I got the new modem? Funny thing is my previous plan was for 300mbs from spectrum and they bumped me up to 400mbs but speeds stayed the same with the 6190 doing a test from the router but when the 8200 is plugged in the speeds are much faster but only on the router doing the speedtest and not from the PC.

I'm thinking maybe the 8200 is too new and they haven't gotten it to work properly or something about my router not liking the 8200?
 
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bill001g

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One thing to be aware of when you have a very fast internet connection is many routers have a hardware acceleration feature. This allows the traffic to bypass the CPU . Pretty much they moved the NAT function to the switch somehow and it no longer delays traffic. Problem is many of the fancy router features must have that option turned off which then force the traffic back via the cpu. On one of the asus routers I have even very simple functions like the traffic utilization report does not function because the traffic is bypassing. Your speed will drop below 300mbps on may routers when you are not using the hardware acceleration.
 
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nyichiban

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Feb 21, 2008
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So you are saying to turn off the NAT function in my router?
 
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nyichiban

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So for QoS I have my computer set as priority and have set downloads, gaming and streaming as priority as well. Just did a speed test from my PC and it's showing 184 down and 23 up while doing the speedtest from the router itself is showing 385 down and 23 up.
 
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bill001g

Titan
Aug 9, 2012
28,282
2,742
125,640
That is because when you even use the simplest QoS functions it disables the NAT acceleration. That means all traffic is now being processed by the cpu rather than using the hardware accelerator chip.

Try to factory reset the router and then only configure the lan ip's and the wireless settings. The router is pretty much only doing the NAT function at this time and that is running via the hardware accelerator so it should be able to run 350m.

 
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